Bill "Billy" Gierhart is an American television director and former steadicam operator.

For many years he worked as a steadicam operator on the television series Pacific Blue, Huff, Swingtown and The Shield, making his directorial debut on the latter series' penultimate episode "Possible Kill Screen" in 2008.

His other credits as a television director include Lone Star, Terriers, The Chicago Code, Sons of Anarchy, Torchwood, Breakout Kings, The Walking Dead and Agents of S.H.I.E.L.D.